Chemical Reactor Modeling of Oxy–Fuel Combustion Chamber for Semiclosed Combined Cycle

2017 ◽  
Vol 31 (10) ◽  
pp. 11348-11361 ◽  
Author(s):  
Vicente P. Timón ◽  
Gregorio Corchero ◽  
José L. Montañés
Keyword(s):  
Combustion Chamber ◽  
Chemical Reactor ◽  
Fuel Combustion ◽  
Combined Cycle ◽  
Reactor Modeling

Investigation on wall and gas temperatures inside a swirled oxy-fuel combustion chamber using thermographic phosphors, O2 rotational and vibrational CARS

Fuel ◽  
2021 ◽  
Vol 289 ◽  
pp. 119787
Author(s):  
Christian Meißner ◽  
Henrik Schneider ◽  
Evaggelos Sidiropoulos ◽  
Jonas I. Hölzer ◽  
Tim Heckmann ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Fuel Combustion ◽  
Thermographic Phosphors

Siemens SGT-800 Industrial Gas Turbine Enhanced to 50MW: Combustor Design Modifications, Validation and Operation Experience

2013 ◽  
Author(s):  
Daniel Lörstad ◽  
Annika Lindholm ◽  
Jan Pettersson ◽  
Mats Björkman ◽  
Ingvar Hultmark
Keyword(s):  
Combustion Chamber ◽  
Gas Turbine ◽  
Cooling System ◽  
Good Condition ◽  
Combined Cycle ◽  
Combustion Stability ◽  
Combustion System ◽  
Design Work ◽  
Engine Operation ◽  
Cooling Air

Siemens Oil & Gas introduced an enhanced SGT-800 gas turbine during 2010. The new power rating is 50.5MW at a 38.3% electrical efficiency in simple cycle (ISO) and best in class combined-cycle performance of more than 55%, for improved fuel flexibility at low emissions. The updated components in the gas turbine are interchangeable from the existing 47MW rating. The increased power and improved efficiency are mainly obtained by improved compressor airfoil profiles and improved turbine aerodynamics and cooling air layout. The current paper is focused on the design modifications of the combustor parts and the combustion validation and operation experience. The serial cooling system of the annular combustion chamber is improved using aerodynamically shaped liner cooling air inlet and reduced liner rib height to minimize the pressure drop and optimize the cooling layout to improve the life due to engine operation hours. The cold parts of the combustion chamber were redesigned using cast cooling struts where the variable thickness was optimized to maximize the cycle life. Due to fewer thicker vanes of the turbine stage #1, the combustor-turbine interface is accordingly updated to maintain the life requirements due to the upstream effect of the stronger pressure gradient. Minor burner tuning is used which in combination with the previously introduced combustor passive damping results in low emissions for >50% load, which is insensitive to ambient conditions. The combustion system has shown excellent combustion stability properties, such as to rapid load changes and large flame temperature range at high loads, which leads to the possibility of single digit Dry Low Emission (DLE) NOx. The combustion system has also shown insensitivity to fuels of large content of hydrogen, different hydrocarbons, inerts and CO. Also DLE liquid operation shows low emissions for 50–100% load. The first SGT-800 with 50.5MW rating was successfully tested during the Spring 2010 and the expected performance figures were confirmed. The fleet leader has, up to January 2013, accumulated >16000 Equivalent Operation Hours (EOH) and a planned follow up inspection made after 10000 EOH by boroscope of the hot section showed that the combustor was in good condition. This paper presents some details of the design work carried out during the development of the combustor design enhancement and the combustion operation experience from the first units.

Simplified Models for NOx Production Rates in Lean-Premixed Combustion

1994 ◽  
Author(s):  
David G. Nicol ◽  
Philip C. Malte ◽  
Robert C. Steele
Keyword(s):  
Laboratory Data ◽  
Chemical Reactor ◽  
Premixed Combustion ◽  
Empirical Correlations ◽  
Simplified Models ◽  
Reactor Modeling ◽  
Lean Premixed Combustion ◽  
Co Concentration ◽  
Lean Premixed ◽  
Recent Laboratory

Simplified models for predicting the rate of production of NOx in lean-premixed combustion are presented. These models are based on chemical reactor modeling, and are influenced strongly by the nitrous oxide mechanism, which is an important source of NOx in lean-premixed combustion. They include 1) the minimum set of reactions required for predicting the NOx production, and 2) empirical correlations of the NOx production rate as a function of the CO concentration. The later have been developed for use in an NOx post-processor for CFD codes. Also presented are recent laboratory data, which support the chemical rates used in this study.

Chemical Kinetic Analysis of a Flameless Gas Turbine Combustor

2008 ◽  
Author(s):  
G. Arvind Rao ◽  
Yeshayahou Levy ◽  
Ephraim J. Gutmark
Keyword(s):  
Combustion Chamber ◽  
Kinetic Analysis ◽  
Gas Turbine ◽  
Flame Temperature ◽  
Plug Flow ◽  
Combustion Process ◽  
Chemical Reactor ◽  
Chemical Kinetic ◽  
Combustion Regime ◽  
Reactor Model

Flameless combustion (FC) is one of the most promising techniques of reducing harmful emissions from combustion systems. FC is a combustion phenomenon that takes place at low O2 concentration and high inlet reactant temperature. This unique combination results in a distributed combustion regime with a lower adiabatic flame temperature. The paper focuses on investigating the chemical kinetics of an prototype combustion chamber built at the university of Cincinnati with an aim of establishing flameless regime and demonstrating the applicability of FC to gas turbine engines. A Chemical reactor model (CRM) has been built for emulating the reactions within the combustor. The entire combustion chamber has been divided into appropriate number of Perfectly Stirred Reactors (PSRs) and Plug Flow Reactors (PFRs). The interconnections between these reactors and the residence times of these reactors are based on the PIV studies of the combustor flow field. The CRM model has then been used to predict the combustor emission profile for various equivalence ratios. The results obtained from CRM model show that the emission from the combustor are quite less at low equivalence ratios and have been found to be in reasonable agreement with experimental observations. The chemical kinetic analysis gives an insight on the role of vitiated combustion gases in suppressing the formation of pollutants within the combustion process.

Study of NO x formation in the combustion chamber of a thermal-clamping combined-cycle plant

2014 ◽  
Vol 52 (1) ◽  
pp. 57-64 ◽  
Author(s):  
V. M. Maslennikov ◽  
V. B. Alekseev ◽  
Yu. A. Vyskubenko ◽  
E. A. Tsalko ◽  
A. I. Antoshin
Keyword(s):  
Combustion Chamber ◽  
Combined Cycle ◽  
Combined Cycle Plant

Influence of a recuperator on the performance of the semi-closed oxy-fuel combustion combined cycle

2017 ◽  
Vol 124 ◽  
pp. 1301-1311 ◽  
Author(s):  
Byeong Seon Choi ◽  
Min Jae Kim ◽  
Ji Ho Ahn ◽  
Tong Seop Kim
Keyword(s):  
Fuel Combustion ◽  
Combined Cycle

scholarly journals Research on GTE-110 gas turbine operating modes for limiting nitrogen oxide emissions of ccgt power units

Vestnik IGEU ◽  
2020 ◽  
pp. 11-21
Author(s):  
I.K. Muravev ◽  
A.B. Korovkin ◽  
R.A. Shitov
Keyword(s):  
Nitrogen Oxides ◽  
Simulation Model ◽  
Combustion Chamber ◽  
Nitrogen Oxide ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Climatic Factors ◽  
Combined Cycle ◽  
Nitrogen Oxide Emissions ◽  
Excess Air

Gas turbines are actively used as a part of combined-cycle power units having less impact on the environ-ment than installations operating on other types of fuel. However, their emissions contain harmful carbon compounds and nitrogen oxides. Some research studies considered the effect of emissions upon changes in the coefficient of excess air. At the same time, no attention was paid to the influence of other operational parameters and technological limitations associated with the safe operation of combined-cycle CCGT equipment, and no assessment was made of the impact of climatic factors on environmental indicators. Thus, it is important to conduct separate studies to assess the influence of regime and climatic factors on the stability of the combustion process in the combustion chamber of a gas turbine, on the environmental performance of the installation and the compliance of these indicators with the standards. The research used data from the control system archive, and a simulation model was developed in the SimInTech environment. The following assumptions are made in the model: the fuel composition does not change and it enters the single combustion zone without separation into the pilot and central zones of the combustion chamber. The methodology for calculating emissions is reduced to dividing their volume into NO and NO2 due to the transformation of nitrogen oxides in the air. Subsequently, the values of the total concentration are recalculated to a single NOx value. A simulation model for calculating emissions has been obtained. The effect of excess air on nitrogen oxide emissions considering the technological zones of gas turbines of outdoor air temperature (To.a) from –20 to +30 оС and the power from 48 to 110 MW has been assessed. It has been shown that near the nominal load the maximum NOx emission are observed. In general, the results obtained indicate that the requirements for NOx emission standards are met in the entire operating range of gas turbine load changes. However, the reserve of a possible deviation of emissions to a critical level is only 10 %. The verification of the developed model is based on operational trends. The recommendations on operational management have been formulated for power unit operators in order to maintain an ac-ceptable level of NOx emissions.

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